Add "v2" readthedocs setup

.readthedocs.yaml

@@ -0,0 +1,19 @@
+# SPDX-FileCopyrightText: 2021 ladyada for Adafruit Industries
+#
+# SPDX-License-Identifier: Unlicense
+
+# Read the Docs configuration file
+# See https://docs.readthedocs.io/en/stable/config-file/v2.html for details
+
+# Required
+version: 2
+
+build:
+  os: ubuntu-20.04
+  tools:
+    python: "3"
+
+python:
+  install:
+    - requirements: docs/requirements.txt
+    - requirements: requirements.txt

.readthedocs.yml

@@ -1,7 +0,0 @@
-# SPDX-FileCopyrightText: 2017 Scott Shawcroft, written for Adafruit Industries
-#
-# SPDX-License-Identifier: Unlicense
-
-python:
-    version: 3
-requirements_file: docs/requirements.txt